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Process for preparing glyphosate

A preparation process, glyphosate technology, applied in botany equipment and methods, compounds of group 5/15 elements of the periodic table, animal repellants, etc., can solve the problem of high consumption of chemical raw materials, high cost, low output, etc. Problems, to achieve the effect of high output, good quality and high yield

Active Publication Date: 2007-03-28
SICHUAN LESHAN FUHUA TONGDA AGRO-CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of high energy consumption, high consumption of chemical raw materials, low output, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Weigh 4600 kg of methanol, 1950 kg of triethylamine, 1425 kg of paraformaldehyde (92% content), 750 kg of glycine (98.5% content), 2830 kg of dimethyl phosphite (98%), 2830 kg of hydrochloric acid (98%) kg (30.5% content).

[0035] Raw material requirements: methanol (less than 0.2% moisture), triethylamine (less than 0.2% moisture), paraformaldehyde (more than 92%), glycine (more than 98.5%;), dimethyl phosphite (more than 95.5%) ), hydrochloric acid (content greater than 30%).

[0036] 2. Put methanol, triethylamine and paraformaldehyde into the reaction kettle, and keep the temperature at 30°C for 20 minutes to carry out depolymerization reaction.

[0037] 3. Add glycine, control the temperature at 20°C, and keep the temperature for 30 minutes to carry out the addition reaction.

[0038] 4. Add dimethyl phosphite, control the temperature to 50°C, and keep the temperature for 60 minutes to carry out the condensation reaction.

[0039] 5. Divide the synthetic sol...

Embodiment 2

[0041] 1. Weigh 4600 kg of methanol, 1950 kg of triethylamine, 1425 kg of paraformaldehyde (96% content), 750 kg of glycine (98.5% content), 2830 kg of dimethyl phosphite (98%), 2830 kg of hydrochloric acid (98%) kg (30.5% content).

[0042] Raw material requirements: methanol (less than 0.2% moisture); triethylamine (less than 0.2% moisture); paraformaldehyde (one content is greater than 92%; the other content is greater than 96%); glycine (more than 98%;); Dimethyl phosphate (content greater than 95.5%); hydrochloric acid (content greater than 30%).

[0043] 2. Put methanol, triethylamine and paraformaldehyde into the reaction kettle, keep the temperature at 38.5°C for 40 minutes, and carry out the depolymerization reaction.

[0044] 3. Add glycine, control the temperature at 42.5°C, keep the temperature for 35 minutes, and carry out the addition reaction.

[0045] 4. Add dimethyl phosphite, control the temperature at 52.5°C, keep the temperature for 70 minutes, and carry ...

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Abstract

The invention discloses a new technology used to make glyphosate. It includes the following steps: weighting up each constituent according to the following mol ratio that methanol 3-10.5, tri-ethylamine 0.8-0.9, paraformaldehyde 1.95-2.05, glycine 1, dimethylphosphite 1.02-1.1, hydrochloric acid 2.9-3.34; de-polymerization that keeping the methanol, tri-ethylamine, and paraformaldehyde at 30-40 degree centigrade for 10-60min; adding glycine and keeping at 20-44 degree centigrade for 10-90min; condensation that adding dimethylphoshpite and keeping at 50-55 degree centigrade for 60-90min; acid hydrolysis that adding the composed liquid into hydrochloric acid and heating up to final 105-125 degree centigrade; crystallizing that producing glyphosate hydrochloride, then decompression, distillation, removing solvent methanol and excess hydrochloric acid. The produced glyphosate has the advantages of high yield, good quality, and low energy consumption.

Description

technical field [0001] The invention relates to a production and preparation process of glyphosate. Background technique [0002] Glyphosate is a non-selective, highly effective, low toxicity, broad systemic herbicide. It can be widely used in the control of crop weeds in tea gardens, orchards, rubber plantations, corn, sugarcane and forests, and can effectively remove hundreds of annual and perennial weeds. At present, the domestic preparation of glyphosate mostly adopts the alkyl acid method, that is, paraformaldehyde or formaldehyde is kept in a methanol solution containing triethylamine for 60 to 90 minutes at a temperature of 33°C to 40°C. Then add glycine into the solution by heating and dissolving, keep the temperature at 42°C for 90-120 minutes, then add dimethyl phosphite, carry out condensation reaction at 60-70°C, the reaction ends after 30-120 minutes, and then Add hydrochloric acid for acid hydrolysis. The hydrochloride of glyphosate is formed, and after the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/38A01N57/10
Inventor 王雪峰
Owner SICHUAN LESHAN FUHUA TONGDA AGRO-CHEM TECH CO LTD
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